Tool retainer for pneumatic hammers



Oct. 1

927 M. STRUNACK 7 Tech RETAINER FOR PNEUMATIC HAMMERS Filed Feb. 21,1927 Inventor 71722770605 [770/064 By @009 Aztorngy Patented Oct. 18,1927.

MICHAEL STRUNACK, OF POTTSTOWN, PENNSYLVANIA.

TOOL RETAINER FOR LPNEUMATIC HAMMERS.

Application filed February 21, 1927.

The present invention relates to a tool retainer for pneumatic hammersto prevent the ejection of the tool from the hammer when the same is notin use.

Another important object of the invention resides in the provision of atool retainer of this nature which may be maintained in an operativeposition at all times during the operation of the pneumatic hammer.

Another very important object of the invention resides in the provisionof a tool retainer of this nature that is light in its construction,easy to handle and one which may be 'readily and quickly engaged. withand disengaged from the pneumatic hammer.

A still further very important object of the invention resides in theprovision of a tool retainer of this nature which is evceedingly simplein its construction, inexpensive to manufacture, strong and durable,thoroughly eliicient and reliable in use. and otherwise well adapted tothe purpose for which it is designed.

'ith the above and numerous other objects in view as will appear as thed cscrip tion proceeds, the invention res des tll certain novel featuresof construction. and in the combination and arrangement of parts as willbe hereinafter more fully described and claimed.

In the drawing Figure 1. is a side elevation of the tool retainer andtool embodying the features of my invention, I

Figure 2 is an edge elevation thereof.

Referring to the drawing in detail. it will be seen that the deviceembodies an QlOI1- gated framedike structure including sides 5 disposedin spaced parallelism and being offset at intervals as is indicated at 6and T to accommodate the difference in diameter of the pneumatic hammerP which is of cow ventional construction. The side members 5 at one endmerge into a transverse member 8 along one edge of which is formed anoutwardly curved flan e 9. The portions of the side members 5 adjacentoffsets 7 are provided with projections 10. The other ends of the sidemembers 5 merge into a transversely extending ring 11 through which thetool 12 projects. This tool 12 is formed with an annular flange l3, anda compress ible coil spring l l is disposed about the tool to impingeagainst the ring 11 and the flange 13 for holding the shank 15 of thetool in Serial No. 170,001.

the pneumatic hammer in the desired manner. A split ring 16 extendstransversely of the frame structure and is attached adjacent its ends tointermediate portions of the side members 5 as at 17 by rivets or in anyother suitable manner adjacent offsets 6. One end of the split ring orband 16 has a headed pin or like fastening element 18 engaged therewithfor attaching one end of a coil spring it), said end being in the formof a loop 20 which may be easily engaged over or disengaged from thefastening element lb. The other end of the spring 19 terminates in aloop 22 for receiving a cotter pin or like fastening element whichpierces looped entensions 24 on the other end of the band 16.

From the above detailed description it will be seen that the coil spring14 is first placed on the tool 12 and then the tool is projected throughthe ring 11. The shank 15 of the tool .12 may now be inserted in thepneumatic hammer and the end member 8 slipped over the end of thepneumatic hammer adjacent the handle so that the band 16 is snappedpartially about the intermediate portion of the pneumatic hammer andwhen in this position the end 20 of the spring 19 may be engaged overthe fastening element 18 to tension the spring 19 to some extent forholding the frame on the pneumatic hammer against accidentaldisplacement. The projections 10 form linger grips for slipping theframe on and off the pneumatic hammer and the flange 9 is particularlyadapted for pulling the frame off of the pneumatic hammer as will bequite apparent. 'hen this retainer is in place it will be seen that thetool 12 is free to reciprocate in the desired manner owing to theyielding qualities of the spring 14 but the tool is prevented from beingdisplaced from the pneumatic hammer until the retainer frame is removed.thereby preventing the munerous accidents which so frequently occurbecause of the flying of the tool from its hammer when the air is turnedon accidentally or when the hammer slips or otherwise nus-managed.

It is thought that the construction, utility, and advantages of thisinvention Will now be quite apparent to those skilled in this art andaccustomed to use the pneumatic ham mcr. The present embodiment of theinvention has been disclosed in detail merely by way of example since inactual practice it attains the features of advantage enumer ated asdesirable in the statement of the invention and the above description.

It is apparent that changes in the details of construction, and in thecombination and arrangement of parts may be resorted to withoutdeparting from the spirit or scope of the invention as hereinafterclaimed or sacrificing any of its advantages.

Having thus described my invention, what I claim as new is 1. A toolretainer for a pneumatic hammer comprising an elongated frame structureone end of which is in the form of a ring through which the tool isadapted to project while the other end is adapted to be disposed overthe handle end of the hammer, a split band fixed adjacent its ends tointermediate portions of the sides of the frame, a spring fixed at oneend to one end of the band and having a detachable engagement with theother end of said band so as to hold the frame structure againstdisplacement from the hammer.

2. A tool retainer for a pneumatic hammer comprising an elongated framestructure one end of which is in the form of a ring through which thetool is adapted to project while the other end is adapted to be disposedover the handle end of the hammer, a split band fixed adjacent its endsto intermediate portions of the sides of the frame, a spring fixed atone end to one end of the band and having a detachable engagement withthe other end of said band so as to hold the frame structure againstdisplacement from the hammer.

3. A tool retainer for a pneumatic hammer comprising an elongated framestructure one end of which is in the form of a ring through which thetool is adapted to project while the other end is adapted to be disposedover the handle end of the harnmer, a split band fixed adjacent its endsto intermediate portions of the sides of the frame, a spring fixed atone end to one end of the band and having a detachable engagement withthe other end of said band so as to hold the frame structure againstdisplace ment from the hammer, a flange formed on the edge of the end ofthe frame adapted to engage over the handle end of the hammer.

4. A tool retainer for a pneumatic hammer comprising an elongated framestructure one end of which is in the form of a ring through which thetool adapted to project while the other end is adapted to be disposedover the handle end of the hammer, a split band fixed adjacent its endsto intermediate portions of the sides of the frame, a spring fixed atone end to one end of the band and having a detachable engagement withthe other end of said band so as to hold the frame structure againstdisplacement from the hammer, a flange formed on the edge of the end ofthe frame adapted to engage over the handle end of the hammer, the sidesof the frame provided with projections adjacent the last-mentioned ends.

5. A tool retainer of the class described, comprising a frame structureformed by a pair of longitudinally extending side members disposed inspaced parallelism and con nected at one end by a transverse ring and atthe other end by a transverse bar, a split band fixed adjacent its endsto intermediate portions of the side members, a spring attached to oneend of the band, means for detachably engaging the other end of thespring with the other end of the band so to hold the frame structureagainst displacement from the hammer.

In testimony whereof I atfix my signature.

MICHAEL STRUNACK.

